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FAQ / Server Products

When I push email to Exchange via IMAP I get the error "BAD Command Argument Error. 11" or "NO Maximum size of appendable message has been exceeded" in newer versions!

This obscure but typically Microsoft error relates to the message size limits set on the IMAP server in Exchange. To change the limits you need to not only increase all your message size limits and account quotas within Exchange but also edit the IMAP configuration file within Exchange.